Konstantin is available for hire

Konstantin Stepanyuk

Verified Expert in Engineering

Software Developer

Novosibirsk, Novosibirsk Oblast, Russia

Toptal member since December 4, 2013

Expertise

Back-end JavaScript Linux Java Subversion (SVN)Java Servlets SQL Apache Maven Git Java Security Ruby on Rails (RoR)Hibernate Spring Node.js Apache Wicket Apache Tomcat JMeter

Bio

Konstantin has experience with both back-end and front-end development technologies and practices. He boasts excellent communication skills and works effectively in team settings. Konstantin has also worked closely with clients on a variety of individual projects.

Portfolio

Intabia

Java, Ruby, React, Angular, Perl, MongoDB, RabbitMQ, Flowable, PostgreSQL, PHP...

Project Pals

JavaScript, AngularJS, D3.js, Ruby on Rails (RoR), Ruby on Rails 5

EasyInspire

Ruby on Rails (RoR), PostgreSQL, Docker, RabbitMQ

Experience

JavaScript - 12 years Java - 10 years Linux - 10 years SQL - 8 years Git - 6 years C++ - 6 years Node.js - 4 years AngularJS - 3 years

Availability

Part-time

Preferred Environment

React, Amazon Web Services (AWS), Python, Node.js, TypeScript, DevOps, Docker, Java, DevOps Engineer, Angular

The most amazing...

...thing I've coded is a scalable and highly available education web portal designed to be used by thousands of students per day.

Work Experience

Senior Full-stack Developer

2016 - 2022

Intabia

Developed the high load app for a mobile operator, responsible for computing mobile usage statistics and calculating user balances.
Created an app for banking that allows score users to define optimal credit value.
Built an app for a logistics company used for the movement and storage of products.
Developed an app for a medical industry client that allows setting up the booking for doctors.

Technologies: Java, Ruby, React, Angular, Perl, MongoDB, RabbitMQ, Flowable, PostgreSQL, PHP, APIs, LAMP, jQuery, WebRTC, Amazon Web Services (AWS), Python, Django, Node.js, Back-end, TypeScript, DevOps, GraphQL, Next.js, SQL, MySQL, Docker, CSS, HTML5, Databases, Firebase

Full-stack Ruby on Rails Developer

2019 - 2020

Project Pals

Developed and maintained RoR-based applications, including analysis, design, coding, and testing.
Handled core back end (RoR) and front-end (Angular) development.
Administrated development environments like dev servers and CI\CD scripts.

Technologies: JavaScript, AngularJS, D3.js, Ruby on Rails (RoR), Ruby on Rails 5

Senior Ruby Developer

2014 - 2016

EasyInspire

Involved in rebuilding the project from PHP Laravel to the RoR platform.
Set up production and dev servers and tasked with releasing implemented applications (Jenkins, CI/CD, Docker).
Developed an interactive user interface by using the Vector.js library D3.

Technologies: Ruby on Rails (RoR), PostgreSQL, Docker, RabbitMQ

Senior Java Developer

2011 - 2014

EastBanc Technologies

Developed and maintained Java-based applications.
Handled core back-end and front-end development.
Administrated environments.
Led projects with team of 4 developers.
Created project architectures.

Technologies: Groovy, JavaScript, Bash, Ruby, Java, Python, Amazon Web Services (AWS), Back-end, DevOps, Node.js, GraphQL, SQL, MySQL, Docker, CSS, HTML5, Databases, Firebase

Engineer

2009 - 2011

UniPro

Developed and supported commercial and open-source projects.
Worked with bioinformatics.
Optimized algorithms using modern computer architectures. Integrated the project “Ugene” as a plug-in.
Developed a friendly user interface.
Created automated tests.

Technologies: JavaScript, Java, Python, Django, Node.js, Back-end, TypeScript, DevOps, Next.js, SQL, MySQL, Docker, CSS, HTML5, Databases, Firebase

Java Developer

2008 - 2010

Sibers Group

Developed and supported commercial projects.
Analyzed, estimated, and planned during the development process.
Created automated tests.
Implemented integration with a FLEX application.
Developed desktop applications.

Technologies: JavaScript, C++, Java, Back-end, DevOps, Node.js, GraphQL, Next.js, SQL, MySQL, Docker, Databases

Developer

2002 - 2006

SGGA

Created automated education tests.
Developed education games.

Technologies: Pascal, C++, JavaScript, Back-end, SQL, MySQL, Docker, Databases

Experience

Ugene

http://ugene.net

A free open-source cross-platform bioinformatics software package.

Education

2009 - 2011

Master's Degree in Applied Mathematics and Computer Science

Novosibirsk State Novosibirsk, - Novosibirsk, Russia

2005 - 2009

Bachelor's Degree in Applied Mathematics and Computer Science

Novosibirsk State Novosibirsk - Novosibirsk, Russia

Skills

Libraries/APIs

JavaMail, JAX-RS, JAXB, Java Servlets, Java Security, RichFaces, AngularUI, Jackson, SAX, Node.js, React, Facebook API, Facebook SDK, X (formerly Twitter) API, Android API, jQuery, LinkedIn API, Google API, WebRTC, AWS Amplify, D3.js, REST APIs

Tools

Apache Ant, Apache Maven, Subversion (SVN), Git, GitHub, Apache Tomcat, IntelliJ IDEA, Apache JMeter, Gradle, JBoss Drools, GitLab, Vim Text Editor, Qt Creator, Eclipse IDE, Microsoft Visual Studio, RabbitMQ, Amazon Cognito

Languages

JavaScript, Java, Groovy, SQL, Ruby, C++, PHP, Python, TypeScript, GraphQL, CSS, HTML5, Bash, Pascal, Perl, Go

Frameworks

JPA, Ruby on Rails (RoR), Hibernate, JUnit, Apache Wicket, AngularJS, Spring, JSF, Apache Struts 2, Ext JS, GWT, Mockito, PowerMock, JBehave, Android SDK, Django, Qt, Angular, Next.js, Ruby on Rails 5

Paradigms

Object-oriented Programming (OOP), Design Patterns, Aspect-oriented Programming, Service-oriented Architecture (SOA), Agile Software Development, Functional Programming, DevOps

Platforms

Linux, Android, Windows, LAMP, Docker, MacOS, Oracle, Amazon Web Services (AWS), Firebase

Storage

MongoDB, MySQL, PostgreSQL, Databases, Amazon DynamoDB

Other

Back-end, Microsoft 365, APIs, Flowable, DevOps Engineer, Design Principles, SOAP, CI/CD Pipelines

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